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Rework the remount path to better seperate the linux vfs portion
and the xfs portion of it. Move the code to more appropriate
places in the tree.
Merge of 2.4.x-xfs:slinx:144140a originally by lord on 04/10/03
  change remount code so that it calls a vfs operation within
  XFS. reorganize the code underneath it. This better separates
  the linux vfs code and the xfs specific code and will let
  us enable more options on remount.
  no XFS_log_write_unmount_ro anymore

/*
 * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of version 2 of the GNU General Public License as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it would be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Further, this software is distributed without any warranty that it is
 * free of the rightful claim of any third person regarding infringement
 * or the like.  Any license provided herein, whether implied or
 * otherwise, applies only to this software file.  Patent licenses, if
 * any, provided herein do not apply to combinations of this program with
 * other software, or any other product whatsoever.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write the Free Software Foundation, Inc., 59
 * Temple Place - Suite 330, Boston MA 02111-1307, USA.
 *
 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
 * Mountain View, CA  94043, or:
 *
 * http://www.sgi.com
 *
 * For further information regarding this notice, see:
 *
 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
 */
#ifndef __XFS_LRW_H__
#define __XFS_LRW_H__

struct vnode;
struct bhv_desc;
struct xfs_mount;
struct xfs_iocore;
struct xfs_inode;
struct xfs_bmbt_irec;
struct page_buf_s;
struct page_buf_bmap_s;

#define XFS_IOMAP_READ_ENTER	3
/*
 * Maximum count of bmaps used by read and write paths.
 */
#define	XFS_MAX_RW_NBMAPS	4

extern int xfs_bmap(struct bhv_desc *, xfs_off_t, ssize_t, int,
			struct page_buf_bmap_s *, int *);
extern int xfsbdstrat(struct xfs_mount *, struct page_buf_s *);
extern int xfs_bdstrat_cb(struct page_buf_s *);

extern int xfs_zero_eof(struct vnode *, struct xfs_iocore *, xfs_off_t,
				xfs_fsize_t, xfs_fsize_t);
extern ssize_t xfs_read(struct bhv_desc *, struct file *,
				const struct iovec *, unsigned long,
				loff_t *, int, struct cred *);
extern ssize_t xfs_write(struct bhv_desc *, struct file *,
				const struct iovec *, unsigned long,
				loff_t *, int, struct cred *);
extern ssize_t xfs_sendfile(struct bhv_desc *, struct file *,
				loff_t *, int, size_t, read_actor_t,
				void *, struct cred *);

extern int xfs_iomap(struct xfs_iocore *, xfs_off_t, ssize_t, int,
				struct page_buf_bmap_s *, int *);
extern int xfs_iomap_write_direct(struct xfs_inode *, loff_t, size_t,
				int, struct xfs_bmbt_irec *, int *, int);
extern int xfs_iomap_write_delay(struct xfs_inode *, loff_t, size_t,
				int, struct xfs_bmbt_irec *, int *);
extern int xfs_iomap_write_allocate(struct xfs_inode *,
				struct xfs_bmbt_irec *, int *);
extern int xfs_iomap_write_unwritten(struct xfs_inode *, loff_t, size_t);

extern int xfs_dev_is_read_only(struct xfs_mount *, char *);

#define XFS_FSB_TO_DB_IO(io,fsb) \
		(((io)->io_flags & XFS_IOCORE_RT) ? \
		 XFS_FSB_TO_BB((io)->io_mount, (fsb)) : \
		 XFS_FSB_TO_DADDR((io)->io_mount, (fsb)))

#endif	/* __XFS_LRW_H__ */